. Bulletin. Forests and forestry -- United States. 23 strength with moisture was developed entirely free from other influences. In many cases a second assumed curve was drawn and a new diagram of results obtained. (Fig. 11.) Notwithstanding this method of elimination of other sources of strength it was found in sev- eral instances, as in the modulus of elasticity, crushing across the grain, and in shearing (Plates VIII, IX, and X), that some of the trees showed such discrepancies in their relation of strength to iiioisture, that the curve of mean values could not be used for reducing results o
. Bulletin. Forests and forestry -- United States. 23 strength with moisture was developed entirely free from other influences. In many cases a second assumed curve was drawn and a new diagram of results obtained. (Fig. 11.) Notwithstanding this method of elimination of other sources of strength it was found in sev- eral instances, as in the modulus of elasticity, crushing across the grain, and in shearing (Plates VIII, IX, and X), that some of the trees showed such discrepancies in their relation of strength to iiioisture, that the curve of mean values could not be used for reducing results on these trees. Such discrepant sets of results are inclosed by dotted lines, and separate curves of correction 3000 PERCENTAGE OF MOISTURE^. Fig. 11.—Method of coiistmctiiig ciuvos of .averages. pine (Phuis polustris). employed in tliese cases. The corresponding pairs (dry and green) of curves for these trees can be ide^itilied by the attached numbers of the trees, the average values for which arc re])rcsente(l by the jilotted points. Oh those sticks which were originally 18-feet long beams three sets of results were obtaincil by tests at approximately .iO, 20 and 12 per cent moisture. The very high percentages of niois ture shown in all these <-urvcs do not represent averages for the tree, but represent the mean re- sults from such sticks as iiad a very liigh pro])orti(m of moisture in tlic grc-u tests. They are inserted to give some further indication of the form of this end of tlie Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Division of Forestry. Washington : G. P. O.
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